基于DSP的船舶电力推进系统滤波装置控制器设计

小型船舶电力系统中非线性负载多、谐波污染严重。针对这一情况,本文设计一款基于DSP的电力系统滤波装置控制器,该控制器结构简单,稳定性好,实验证明该控制器能有效降低谐波污染,具有一定实用价值。     

谐波共振对电力系统的影响及其解决办法浅析

介绍一般电力系统中谐波污染的种类及其影响,提出了用频率扫描法来解决谐波污染的新方法,最后给出了示例.通过仿真结果证明,这是一种有效解决谐波污染的好方法.     

一种船舶电力滤波器的仿真研究

在小型船舶电力推进系统中,变频驱动产生了严重的谐波污染,导致电力系统的容量大大增加,恶化电网电能质量,甚至影响了船舶安全运行.针对电力推进船舶电网存在的谐波污染问题,设计了电力滤波器的拓扑结构,制定其控制策略,分析该滤波器的工作原理,并进行计算机仿真,验证了该滤波器的有效性.     

基于SAPF的船舶电力系统谐波抑制

为避免大量强非线性负载的使用给船舶电力系统带来严重谐波污染,提出采用并联型有源电力滤波器(SAPF)实现船舶电力系统的谐波抑制。在建立船舶电力系统仿真平台的基础上,从分析船舶典型强非线性负载的谐波成分入手,设计并联型有源滤波器的谐波电流检测模块和补偿电流跟踪控制模块。仿真结果证明并联型有源滤波器对船舶电力系统谐波抑制的有效性。     

全电力推进舰船电力系统谐波仿真与实验

谐波污染是当前电力系统中的一大问题。为了定量的对舰船电力系统各电压、电流进行谐波分析,在实验室建立了200:1的模拟电力系统,并在仿真软件上建立了此物理模拟系统的数值仿真模型,对系统的谐波进行了仿真计算和实验研究,结果表明,本系统谐波含量符合要求,仿真模型是正确的,为全电力推进舰船的电力系统的全尺寸仿真奠定了基础。     

船舶电力系统谐波干扰抑制技术

针对主动型谐波干扰抑制技术应用效果问题,提出一种被动型船舶电力系统谐波干扰抑制技术。该技术首先对电力系统谐波功率进行分析,包括谐波电流和电压计算,然后利用傅里叶变换和小波包变换算法对船舶电力系统谐波进行检测,最后根据检测结果,利用并联型有源电力滤波器实现谐波抑制。结果表明:与2种主动型谐波干扰抑制技术相比,本次研究的被动型船舶电力系统谐波干扰抑制技术应用下,电流畸变率降低8.3%,达到了国家规定的5%以下标准要求,由此可见,本方法抑制效果更好。     

舰船电力系统谐波的智能检测研究

舰船电力系统包含大量的非线性负载,谐波产生的概率相当高,谐波会对舰船电力系统产生很大干扰,而当前舰船电力系统谐波检测算法存在检测精度低、实时性不高等局限性,为了解决当前舰船电力系统谐波检测过程中存在的缺陷,设计一种舰船电力系统谐波的智能检测算法。首先分析了舰船电力系统谐波产生的原因,并提取舰船电力系统谐波检测相关数据,然后采用RBF神经网络建立舰船电力系统谐波的智能检测法,最后在Matlab2017平台上进行了舰船电力系统谐波检测的仿真模拟测试,结果表明,本文算法检测舰船电力系统谐波成功概率相当高,降低了舰船电力系统谐波检测误差,而且可以实现舰船电力系统谐波的实时性检测。     

动态负载仿真控制器的设计与研究

本文介绍了舰船电力系统动态负载仿真控制器的设计以及实现.该装置以Intel 80C196KC单片机为核心的控制器硬件方案设计及相应的存储器扩展、人机接口、数据采集通道、PWM脉冲的输出、通讯接口等具体电路.该控制器成功地对舰船电力系统常见的四种负载进行了数字仿真,并已成功应用于某舰船电力系统仿真实验室中.     

船舶综合电力推进系统电力谐波标准探讨

交流推进系统中的大功率变流装置产生大量高次谐波,对船舶电力系统发、配、用电设备造成不良影响,甚至出现严重危害。为了控制谐波"污染",各国和船级社都对谐波制定了相关标准,虽然都是针对电力系统谐波提出的限制标准,但是这些标准在范围、内容、限制指标上存在较大差异。文中对几种常用标准的谐波限值指标进行了对比和分析,对综合电力推进船舶的谐波标准进行了初步探讨。     

电力电子技术及电力系统谐波治理

本文综述了电力电子技术发展状况及所产生的负面影响，介绍了电力系统谐波的抑制及补偿技术，指出对谐波污染进行有效的治理。     

第十二届深水操作会议和展览会(英文)

正November 4-6,2014Moody Gardens HotelConvention Center/Galveston,TX The Deepwater Operations Conference and Exhibition is celebrating its 12th anniversary this year.This growing event will continue the tradition of excellence in addressing operational challenges involved in developing deepwater resources.We will return to the Moody Gardens Hotel and Convention Center on November 5-7,2014 in Galveston,Texas.     

The 11th International Conference on Hydrodynamics (ICHD 2014)

正19–24 October 2014 SingaporeCONFERENCE THEMES The overall aim of the ICHD Conference is to provide a forum for participants from around the world to review,discuss and present the latest developments in the broad discipline of hydrodynamics and fluid mechanics.The first International Conference on Hydrodynamics(ICHD)was initiated in 1994 in Wuxi,China.Since then,9 more ICHD conferences were held subsequently in Hong Kong,Seoul,Yokohama,Tainan,Perth,Ischia,Nantes,Shanghai and St Petersburg.Evidently the ICHD conference has become an important event among academics,researchers,engineers and operators,working in the fields closely related to the science and technology of hydrodynamics.The 11th ICHD will be held in Singapore in 2014.     

33rd International Conference on Ocean,Offshore and Arctic Engineering （OMAE2014）

正San Francisco,California,June 8-13,2014.OMAE 2014 is the ideal forum for researchers,engineers,managers,technicians and students from the scientific and industrial communities from around the world to:·meet and present advances in technology and its scientific support;·to exchange ideas and experiences whilst promoting technological progress and its application in industry·to promote international cooperation in ocean,offshore and arctic engineering.In line with the tradition of excellence of previous OMAE conferences,more than 900 technical papers are planned for presentation.Outreach for Engineers Specialty Forum This Specialty Forum is designed for students and professionals who may not be familiar with the Ocean and Offshore industry,as well as those who have just recently specialized in this field.     

Catalyzing Coastal Management in Kenya and Zanzibar: Building Capacity and Commitment

Site-based projects were initiated in Chawka Bay-Paje, Zanzibar, and Nyali-Bamburi-Shanzu, Kenya, to demonstrate the benefits of an integrated coastal management (ICM) approach for addressing coastal issues such as tourism development and enhancement of resource-dependent village economies in eastern Africa. A two-year, multidonor project used three primary strategies to make rapid, but sustainable, progress toward ICM. These included using interagency government teams for ICM planning, adopting an internationally recognized framework for ICM as a project ''road map,'' and explicitly incorporating capacity-building strategies into all aspects of the project. Within two years, integrated ICM action strategies, prepared through participatory processes, were being implemented at both sites, and both teams were working to expand the scale and scope of ICM in their nation. More importantly, the project helped create committed, capable, interagency groups that continue to work together to address urgent ICM issues.     

A simplified method for reliability- and integrity-based design of engineering systems and its application to offshore mooring systems

This paper presents a simplified method for the reliability- and the integrity-based optimal design of engineering systems and its application to offshore mooring systems. The design of structural systems is transitioning from the conventional methods, which are based on factors of safety, to more advanced methods, which require calculation of the failure probability of the designed system for each project. Using factors of safety to account for the uncertainties in the capacity (strength) or demands can lead to systems with different reliabilities. This is because the number and arrangement of components in each system and the correlation of their responses could be different, which could affect the system reliability. The generic factors of safety that are specified at the component level do not account for such differences. Still, using factors of safety, as a measure of system safety, is preferred by many engineers because of the simplicity in their application. The aim of this paper is to provide a simplified method for design of engineering systems that directly involves the system annual failure probability as a measure of system safety, concerning system strength limit state. In this method, using results of conventional deterministic analysis, the optimality factors for an integrity-based optimal design are used instead of generic safety factors to assure the system safety. The optimality factors, which estimate the necessary change in average component capacities, are computed especially for each component and a target system annual probability of system failure using regression models that estimate the effect of short and long term extreme events on structural response. Because in practice, it is convenient to use the return period as a measure to quantify the likelihood of extreme events, the regression model in this paper is a relationship between the component demands and the annual probability density function corresponding to every return period. This method accounts for the uncertainties in the environmental loads and structural capacities, and identifies the target mean capacity of each component for maximizing its integrity and meeting the reliability requirement. In addition, because various failure modes in a structural system can lead to different consequences (including damage costs), a method is introduced to compute optimality factors for designated failure modes. By calculating the probability of system failure, this method can be used for risk-based decision-making that considers the failure costs and consequences. The proposed method can also be used on existing structures to identify the riskiest components as part of inspection and improvement planning. The proposed method is discussed and illustrated considering offshore mooring systems. However, the method is general and applicable also to other engineering systems. In the case study of this paper, the method is first used to quantify the reliability of a mooring system, then this design is revised to meet the DNV recommended annual probability of failure and for maximizing system integrity as well as for a designated failure mode in which the anchor chains are the first components to fail in the system.     

含裂纹钢板复合材料修补强度和刚度数值分析

用ANSYS有限元分析软件对复合材料补片修复含边裂纹和中心裂纹钢板的强度和刚度进行了数值分析.引入相对刚度的概念,研究了钻有止裂孔裂纹的长度对损伤钢板相对刚度的影响,分析了损伤钢板刚度复合材料贴片修补效果;引入屈服载荷提高率的概念,分析了损伤钢板强度的修复效果.     

混凝土道路、堆场面层裂缝的产生与防治

从混凝土道路、堆场的各个结构层分析裂缝产生的原因,并针对性地说明预防措施,阐述裂缝维修方法。     

舰艇反鱼雷技术

对目前舰艇反鱼雷技术中的非杀伤、软杀伤和硬杀伤等比较先进的手段进行了阐述,并在此基础上分析研究了舰艇反鱼雷技术的发展趋势。     

利比亚米苏拉塔市萨瓦瓦区5000套住宅项目中心区设计

从确定符合项目实际情况的设计原则入手,通过利比亚米苏拉塔市萨瓦瓦住宅区中心区总体布局和建筑设计两个方面的设计实践,探讨了"传统、现代与文脉"这一当今时代无法回避的文化议题。并且针对具有鲜明文化、宗教和气候特征的建筑设计的特点、方法与风格进行了总结,为今后的实践提供借鉴。     

Community-Based Management for Sustainable Fisheries Resources in Phang-nga Bay,Thailand

Fishing communities, the Government of Thailand Department of Fisheries, local nongovermnental organizations, universities, the Food and Agriculture Organization of the United Nations (FAO), and FAO's Bay of Bengal Program have undertaken a partnership in management of Phang-nga Bay's coastal resources. It is the first project of its kind in Thailand, and although still in the early stages, offers insights that may contribute to our knowledge of how we can improve our management of coastal resources, including the importance of (1) building relationships within the governance process; (2) combining education, enforcement, and economic incentives to achieve compliance; (3) implementing solutions early; and (4) government support of community-based decisions. These insights reinforce trends emerging in other coastal management projects in the Asian region.